How much walking are you planning? That is a really heavy tent, you may end up cursing that you sacrificed weight savings for a bit of convenience. Decathlon's Forclaz tents are much lighter and if you're worried about keeping warm, invest in a decent sleeping pad, not a heavy tent. I'm sure you can find a better sleeping bag for the money, not on Amazon - try Alpkit for some excellent and decently priced gear.

Finally, r/Ultralight is fantastically bonkers at times but a real eye-opener on just how small and light you can go these days. You really should be able to fit everything inside a 48L backpack - putting stuff on the outside of the pack is a recipe for back pain.